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Electrical Machines

Electrical Machines
In a dc machine 4 pole lap winding is used. The number of parallel paths are?

 4
 1
 2
 8

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Electrical Machines
No load test on induction motor is conducted to find which of the following losses?

 Stator copper loss
 Stator core loss
All of these
 Rotational loss

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Electrical Machines
Two generators G1 and G2 are to be operated in parallel to deliver a total current of 60 A. Generator one has a terminal voltage of 280 V on no load and 240 V when supplying 40 A current. Similarly the second generator has a voltage of 300 V when on no load and 240 V when supplying of 50 A of current. The output voltage of each generator will be

 240 V.
 238.2 V.
  256.4 V.
 271.7 V.

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Electrical Machines
As compared to an induction motor, the air gap in a DC motor is

 less than 50%.
 between 50% and 90%.
 same.
 more.

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Electrical Machines
For a DC Motor for constant load torque, what will happen to the armature current if armature resistance increases?

 Increases.
 Remain unchanged
 None of above.
 Decreases.

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Electrical Machines
In case of a compensated DC series motor, the compensating winding is provided

 In parallel with the field winding.
 In parallel with the armature winding.
 As a separate unit.
  In series with the armature winding.

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